package com.yl.module.common.controller;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.yl.module.base.controller.BaseController;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**
 * 图形验证码
 * @Author jiangtao
 * @CreateBy 2019-01-16 10:25 PM
 * @UpdateBy jiangtao
 * @Version v1.0
 */
@Slf4j
@Controller
@RequestMapping
public class CaptchaController extends BaseController {

    @Autowired
    private DefaultKaptcha defaultKaptcha;

    @RequestMapping("captcha")
    public void generateCode(HttpServletRequest request, HttpServletResponse response) throws IOException {

        response.setDateHeader("Expires", 0);// 禁止server端缓存
        // 设置标准的 HTTP/1.1 no-cache headers.
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        // 设置IE扩展 HTTP/1.1 no-cache headers (use addHeader).
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        response.setHeader("Pragma", "no-cache");// 设置标准 HTTP/1.0 不缓存图片
        response.setContentType("image/jpeg");// 返回一个 jpeg 图片，默认是text/html(输出文档的MIMI类型)
        String capText = defaultKaptcha.createText();// 为图片创建文本

        // 将文本保存在session中。这里就使用包中的静态变量吧
        HttpSession session = request.getSession();
        session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);

        BufferedImage bi = defaultKaptcha.createImage(capText); // 创建带有文本的图片
        ServletOutputStream out = response.getOutputStream();
        // 图片数据输出
        ImageIO.write(bi, "jpg", out);
        try {
            out.flush();
        } finally {
            out.close();
        }

        log.info("Session 验证码是：" + session.getAttribute(Constants.KAPTCHA_SESSION_KEY));

    }
}
